iPad Pro 5th gen. with M1 - Screen mirroring with cable

Hello all,

I have an iPad Pro model A2378. I need to connect iPad with HDMI cable (by dongle) to an external monitor, for conferences and lessons.

When I do this, and Stage Manager is activated, the mirroring on the external monitor is 16:9 (not 4:3 as iPad) and also I can decide what to project on the external one. This works well.

Differently, when I connect in the same way (dongle -> HDMI cable, Stage Manager activated) the iPad to an external projector (not a monitor), it keeps the resolution in 4:3 and I see only screen mirroring without the possibility to choose the apps to project, as an older iPad without M1.

Someone has the same situation and/or has solved it? How to do?

Thank you a lot,

Riccardo L.